#7170B1

CSS

:root {
  --twinkle-night: #7170b1;
  --twinkle-night-rgb: 113 112 177;
  --twinkle-night-oklch: oklch(0.574 0.099 283.5);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(241 29% 57%);
  border-color: oklch(0.574 0.099 283.5);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #7170b1;
  --color-twinkle-night-50: #f2f2ff;
  --color-twinkle-night-100: #e4e4ff;
  --color-twinkle-night-200: #cfcffe;
  --color-twinkle-night-300: #b2b1e9;
  --color-twinkle-night-400: #9697d7;
  --color-twinkle-night-500: #7e7dc6;
  --color-twinkle-night-600: #6b6aa7;
  --color-twinkle-night-700: #555486;
  --color-twinkle-night-800: #3d3e64;
  --color-twinkle-night-900: #2a2b46;
  --color-twinkle-night-950: #17182e;
}

SCSS

$twinkle-night: #7170b1;
$twinkle-night-rgb: 113, 112, 177;
$twinkle-night-light: mix(#fff, $twinkle-night, 20%);
$twinkle-night-dark: mix(#000, $twinkle-night, 20%);

.element {
  color: $twinkle-night;
  box-shadow: 0 0 0 2px rgba($twinkle-night, 0.35);
}